US20150211487A1 - Dual purpose slat-spoiler for wind turbine blade - Google Patents
Dual purpose slat-spoiler for wind turbine blade Download PDFInfo
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- US20150211487A1 US20150211487A1 US14/164,879 US201414164879A US2015211487A1 US 20150211487 A1 US20150211487 A1 US 20150211487A1 US 201414164879 A US201414164879 A US 201414164879A US 2015211487 A1 US2015211487 A1 US 2015211487A1
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- Prior art keywords
- slat
- blade
- gap
- suction side
- pivot
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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- 230000009977 dual effect Effects 0.000 title claims description 4
- 230000007246 mechanism Effects 0.000 claims abstract description 20
- 230000008901 benefit Effects 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 210000003746 feather Anatomy 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D7/00—Controlling wind motors
- F03D7/02—Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor
- F03D7/022—Adjusting aerodynamic properties of the blades
- F03D7/0232—Adjusting aerodynamic properties of the blades with flaps or slats
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D7/00—Controlling wind motors
- F03D7/02—Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor
- F03D7/022—Adjusting aerodynamic properties of the blades
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D7/00—Controlling wind motors
- F03D7/02—Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor
- F03D7/0256—Stall control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2240/00—Components
- F05B2240/20—Rotors
- F05B2240/30—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
- F05B2240/305—Flaps, slats or spoilers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2240/00—Components
- F05B2240/20—Rotors
- F05B2240/30—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
- F05B2240/305—Flaps, slats or spoilers
- F05B2240/3052—Flaps, slats or spoilers adjustable
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
Definitions
- This invention relates generally to the field of wind turbines, and more specifically to an apparatus for aerodynamic load reduction on wind turbines in high winds, and in particular to a dual purpose slat and spoiler for wind turbine blades.
- Wind turbine blades have thick airfoil sections near the blade root to enable low-mass designs due to high structural efficiency.
- structural efficiency comes at the cost of decreased aerodynamic efficiency.
- Full-span blade pitch control effectively controls the aerodynamic rotor power by altering the angle of attack along the blade.
- the blades are pitched more towards feather (“into the wind”) which reduces the angle of attack and the resulting aerodynamic forces.
- this creates a large increase in lift generating potential during wind gusts ( FIG. 10 ) which can quickly increase the angle of attack, leading to sharply increased aerodynamic forces and loads on the blades and other turbine components
- This imposes high structural strength margin requirements on all parts of the wind turbine installation, from the blades to the base of the tower, with resultant weight and expense.
- FIG. 1 is a suction side view of a prior art wind turbine rotor with slats.
- FIG. 2 is a perspective view of an inboard portion of a prior art wind turbine blade with slats.
- FIG. 3 is a transverse sectional view of a thick airfoil section with a slat taken along line 3 - 3 of FIG. 1 .
- FIG. 4 shows a slat/spoiler pivot embodiment according to aspects of the invention.
- FIG. 5 shows another slat/spoiler pivot embodiment according to aspects of the invention
- FIG. 6 shows a gate embodiment according to aspects of the invention.
- FIG. 7 shows a butterfly plate embodiment according to aspects of the invention.
- FIG. 8 shows damper embodiment according to aspects of the invention
- FIG. 9 shows a control system embodiment for the invention
- FIG. 11 shows a slat/spoiler pivot embodiment with actuators in the rotor hub
- FIG. 1 shows a downwind side of a wind turbine rotor 20 with radially-oriented blades 22 , sometimes referred to as main airfoils, which rotate generally in a plane 23 or disc of rotation
- the suction sides 40 of the blades are seen in this view, with the wind being directed generally through/into the plane of the page Only rotating elements are illustrated in this figure, with the typical nacelle and tower of a wind turbine power plant not being shown.
- Each main blade 22 has a radially inboard end or root end 24 that is thick to withstand flapwise loads that are normal to the chord of the blade airfoil.
- the roots 24 are attached to a common hub 26 that may have a cover called a spinner 28 .
- Each blade may have an aerodynamic slat 30 mounted above a leading portion of each blade 22 by support structures such as aerodynamic struts 32 .
- Slats provide increased aerodynamic efficiency and increased lift on the thick airfoil sections, both by acting as efficient small airfoils and by delaying and reducing flow separation on the suction side of the main airfoil
- FIG. 2 is a perspective view of an inboard portion 36 of a blade 22 having a pressure side 38 and a suction side 40 between a leading edge 42 and a trailing edge 44
- Transverse sectional profiles of the blade may gradually transition from cylindrical PC at the root 24 to an airfoil shape PA at and past the shoulder 47 which is the position of longest chord length of the blade 22 .
- the slat 30 may have an efficient airfoil shape and angle of attack in normal operation throughout its span between its inboard end 30 A and outboard end 30 B.
- the main airfoil 22 and the slat 30 have respective chord lengths C 1 , C 2 .
- FIG. 3 shows a thick inboard airfoil section of a wind turbine blade 22 with a chord length C 1 between leading and trailing edges 42 , 44 .
- a slat 30 is mounted with a given gap distance 31 above a leading suction side portion of the airfoil on aerodynamic struts 32 .
- Also shown are a rotation plane 23 , absolute wind direction 46 , relative wind direction 48 , and stream lines 50 influenced by the slat over the airfoil The slat helps prevent flow separation above the suction side 40 .
- FIG. 4 shows a slat/spoiler embodiment 51 A according to aspects of the invention.
- the trailing edge 52 of the slat 30 pivots toward the main airfoil 22 via a pivot axis or bearing 54 actuated by means such as a servo motor, electromechanical solenoid, or hydraulic piston located for example in the blade, in a support strut 32 , or in the rotor hub.
- the slat 30 stalls and partly or completely closes the gap between the slat and the main airfoil, causing the slat to act as a spoiler. This separates airflow 53 from the suction side 40 of the main airfoil, causing a loss of lift.
- the axis of the pivot bearing 54 may be located at any position along the slat, such as at the aerodynamic center of the slat 30 in one embodiment to minimize actuation force, or at 25-50% of the slat chord length from the leading edge of the slat in other non-limiting embodiments
- FIG. 5 shows a slat/spoiler embodiment 51 B in which the leading edge 56 of the slat 30 pivots toward the main airfoil 22 in high winds.
- the minimum length of the gap between the slat 30 and the main airfoil 22 may be partly or completely closed by the pivot action
- the slat 30 pivots about a pivot bearing 54 on the support struts 32 under control of an actuator, such as a servo motor, electromechanical solenoid, hydraulic piston or other suitable means located in or on the blade 22 , in a support strut 32 , or in the rotor hub.
- Embodiments 51 A and 51 B may use the same or similar hardware, the difference being the direction of pivot, which may be determined based on wind conditions and the amount of aerodynamic braking wanted.
- FIG. 6 shows a slat/spoiler embodiment 51 C in which an extendable gate 58 forms a gate valve in the gap 31 that partially or completely or closes the gap between the slat 30 and the main airfoil 22 .
- the gate 58 may be extended and retracted by an actuator in the main airfoil, such as a motor driven helical or pinion drive, electromechanical solenoid, or a hydraulic piston, as non-limiting examples.
- FIG. 7 shows a slat/spoiler embodiment 51 D in which a rotatable butterfly plate 59 partially or completely closes the gap between the slat 30 and the main airfoil 22 .
- the butterfly plate may be rotated by an actuator in the strut 32 , in the main airfoil 22 , or in the rotor hub.
- FIG. 8 shows a slat/spoiler embodiment 51 E in which a damper plate 62 forms a valve that partially or completely closes the gap 31 between the slat 30 and the main airfoil 22
- the damper plate 60 may be rotated by an actuator in the strut 32 , or in the main airfoil, or in the rotor hub
- the slat 30 may be fixed and stationary with respect to the blade 22 .
- FIG. 9 shows a control logic unit 64 that uses available sensor inputs such as wind speed 66 , pitch 67 , and rotor speed 68 and/or derived parameters to activate the spoiler function of the embodiments herein via actuators 70 when one or more predetermined thresholds are reached
- the spoiler function i e reduction of the gap
- the spoiler function may be activated when the wind reaches or exceeds a rated condition. This may be determined, for example, by wind speed and possibly other factors such as wind variability or aerodynamic loading on the rotor. Wind variability may be derived for example from instantaneous changes in wind speed or by derived metrics means such as statistical variance, or a combination of higher order wind speed derivatives.
- FIG. 10 shows the lift coefficient on a wind turbine blade as a function of angle of attack Gusts can quickly increase both the wind speed and angle of attack During normal operation a gust causes a stall after a small increase in lift 72 During post-rated (high wind) operation the angle of attack is conventionally reduced to reduce lift. But this enables a greater increase in lift 74 caused by gusts before stall occurs, allowing high peaks in aerodynamic loading and subsequent structural stresses and fatigue.
- the invention allows the angle of attack to remain higher during post-rated operation, thus protecting the blade from overstress by enabling more rapid stall on the main airfoil during gusts than in the prior art.
- FIG. 11 shows an embodiment 51 F in which each slat 30 extends from a respective pivot bearing 78 the rotor hub 26
- Each slat pivots about a spanwise axis 80 positioned for example at 25-50% of the slat chord length C 2 from the leading edge of the slat or positioned along an aerodynamic center of the slat.
- This embodiment may be implemented with cantilever slats without support struts Thus, it provides a relatively simple retrofit, for example, by installing a replacement spinner with attached slats 30 , actuators 70 , and power and logic connections 76 .
- the invention builds upon the use of multi-element airfoils by incorporating aerodynamic load control capabilities. These additional abilities reduce operational and non-operational aerodynamic blade loads and provide a mechanism for controlling rotor torque and power in addition to full-span pitch control
- the spoiler mechanisms of the embodiments herein have aerodynamic and structural synergy with the slat.
Abstract
Description
- This invention relates generally to the field of wind turbines, and more specifically to an apparatus for aerodynamic load reduction on wind turbines in high winds, and in particular to a dual purpose slat and spoiler for wind turbine blades.
- Wind turbine blades have thick airfoil sections near the blade root to enable low-mass designs due to high structural efficiency. However, structural efficiency comes at the cost of decreased aerodynamic efficiency. Use of multi-element airfoils, which may include a slat and/or flap on the thick blade sections, generally improves aerodynamic performance while maintaining structural efficiency
- Full-span blade pitch control effectively controls the aerodynamic rotor power by altering the angle of attack along the blade. When a wind turbine is operating at rated power output, the blades are pitched more towards feather (“into the wind”) which reduces the angle of attack and the resulting aerodynamic forces. However, this creates a large increase in lift generating potential during wind gusts (
FIG. 10 ) which can quickly increase the angle of attack, leading to sharply increased aerodynamic forces and loads on the blades and other turbine components This imposes high structural strength margin requirements on all parts of the wind turbine installation, from the blades to the base of the tower, with resultant weight and expense. - The invention is explained in the following description in view of the drawings that show.
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FIG. 1 is a suction side view of a prior art wind turbine rotor with slats. -
FIG. 2 is a perspective view of an inboard portion of a prior art wind turbine blade with slats. -
FIG. 3 is a transverse sectional view of a thick airfoil section with a slat taken along line 3-3 ofFIG. 1 . -
FIG. 4 shows a slat/spoiler pivot embodiment according to aspects of the invention. -
FIG. 5 shows another slat/spoiler pivot embodiment according to aspects of the invention -
FIG. 6 shows a gate embodiment according to aspects of the invention. -
FIG. 7 shows a butterfly plate embodiment according to aspects of the invention. -
FIG. 8 shows damper embodiment according to aspects of the invention -
FIG. 9 shows a control system embodiment for the invention -
FIG. 10 is a graph of lift coefficient as a function of angle of attack as known in the art. -
FIG. 11 shows a slat/spoiler pivot embodiment with actuators in the rotor hub -
FIG. 1 shows a downwind side of awind turbine rotor 20 with radially-orientedblades 22, sometimes referred to as main airfoils, which rotate generally in aplane 23 or disc of rotation Thesuction sides 40 of the blades are seen in this view, with the wind being directed generally through/into the plane of the page Only rotating elements are illustrated in this figure, with the typical nacelle and tower of a wind turbine power plant not being shown. Eachmain blade 22 has a radially inboard end orroot end 24 that is thick to withstand flapwise loads that are normal to the chord of the blade airfoil. Theroots 24 are attached to acommon hub 26 that may have a cover called aspinner 28. Each blade may have anaerodynamic slat 30 mounted above a leading portion of eachblade 22 by support structures such asaerodynamic struts 32. Slats provide increased aerodynamic efficiency and increased lift on the thick airfoil sections, both by acting as efficient small airfoils and by delaying and reducing flow separation on the suction side of the main airfoil -
FIG. 2 is a perspective view of aninboard portion 36 of ablade 22 having apressure side 38 and asuction side 40 between a leadingedge 42 and atrailing edge 44 Transverse sectional profiles of the blade may gradually transition from cylindrical PC at theroot 24 to an airfoil shape PA at and past theshoulder 47 which is the position of longest chord length of theblade 22. Theslat 30 may have an efficient airfoil shape and angle of attack in normal operation throughout its span between itsinboard end 30A andoutboard end 30B. Themain airfoil 22 and theslat 30 have respective chord lengths C1, C2. -
FIG. 3 shows a thick inboard airfoil section of awind turbine blade 22 with a chord length C1 between leading andtrailing edges slat 30 is mounted with a givengap distance 31 above a leading suction side portion of the airfoil onaerodynamic struts 32. Also shown are arotation plane 23,absolute wind direction 46,relative wind direction 48, andstream lines 50 influenced by the slat over the airfoil The slat helps prevent flow separation above thesuction side 40. -
FIG. 4 shows a slat/spoiler embodiment 51A according to aspects of the invention. Thetrailing edge 52 of the slat 30 pivots toward themain airfoil 22 via a pivot axis or bearing 54 actuated by means such as a servo motor, electromechanical solenoid, or hydraulic piston located for example in the blade, in asupport strut 32, or in the rotor hub. In the shown pivoted position, the slat 30 stalls and partly or completely closes the gap between the slat and the main airfoil, causing the slat to act as a spoiler. This separatesairflow 53 from thesuction side 40 of the main airfoil, causing a loss of lift. Employing this effect during high operational wind speeds (after rated power has been achieved) reduces the amount of lift and power generated by the inboard blade sections equipped with spoiler slats To make-up for this reduced inboard power production the entire blade must then be pitched such that the outboard blade runs at a higher angle of attack, closer to stall, and therefore the potential for large aerodynamic load changes in the event of a gust for the entire blade (inboard and outboard) is reduced This effect can also be deployed during parked conditions or other non-operational states such that the spoiler limits the maximum possible lift that can be generated by the equipped sections in the event of extreme wind speeds. One benefit is that longer wind turbine blades are possible, allowing higher-efficiency wind turbines Another benefit is reduction in installation cost by reducing overall strength requirements and weight. Another benefit is reduced pitch activity and thus reduced wear on the pitch control system. Another benefit is reduction in pitch system cost, since it does not have to be as fast to react as quickly to gusts The axis of the pivot bearing 54 may be located at any position along the slat, such as at the aerodynamic center of the slat 30 in one embodiment to minimize actuation force, or at 25-50% of the slat chord length from the leading edge of the slat in other non-limiting embodiments -
FIG. 5 shows a slat/spoiler embodiment 51B in which the leadingedge 56 of the slat 30 pivots toward themain airfoil 22 in high winds. The minimum length of the gap between theslat 30 and themain airfoil 22 may be partly or completely closed by the pivot action The slat 30 pivots about a pivot bearing 54 on thesupport struts 32 under control of an actuator, such as a servo motor, electromechanical solenoid, hydraulic piston or other suitable means located in or on theblade 22, in asupport strut 32, or in the rotor hub.Embodiments -
FIG. 6 shows a slat/spoiler embodiment 51C in which anextendable gate 58 forms a gate valve in thegap 31 that partially or completely or closes the gap between theslat 30 and themain airfoil 22. Thegate 58 may be extended and retracted by an actuator in the main airfoil, such as a motor driven helical or pinion drive, electromechanical solenoid, or a hydraulic piston, as non-limiting examples. -
FIG. 7 shows a slat/spoiler embodiment 51D in which arotatable butterfly plate 59 partially or completely closes the gap between theslat 30 and themain airfoil 22. The butterfly plate may be rotated by an actuator in thestrut 32, in themain airfoil 22, or in the rotor hub. -
FIG. 8 shows a slat/spoiler embodiment 51E in which a damper plate 62 forms a valve that partially or completely closes thegap 31 between theslat 30 and themain airfoil 22 Thedamper plate 60 may be rotated by an actuator in thestrut 32, or in the main airfoil, or in the rotor hub Inembodiments slat 30 may be fixed and stationary with respect to theblade 22. -
FIG. 9 shows acontrol logic unit 64 that uses available sensor inputs such aswind speed 66,pitch 67, androtor speed 68 and/or derived parameters to activate the spoiler function of the embodiments herein viaactuators 70 when one or more predetermined thresholds are reached For example, the spoiler function (i e reduction of the gap) may be activated when the wind reaches or exceeds a rated condition. This may be determined, for example, by wind speed and possibly other factors such as wind variability or aerodynamic loading on the rotor. Wind variability may be derived for example from instantaneous changes in wind speed or by derived metrics means such as statistical variance, or a combination of higher order wind speed derivatives. -
FIG. 10 shows the lift coefficient on a wind turbine blade as a function of angle of attack Gusts can quickly increase both the wind speed and angle of attack During normal operation a gust causes a stall after a small increase inlift 72 During post-rated (high wind) operation the angle of attack is conventionally reduced to reduce lift. But this enables a greater increase inlift 74 caused by gusts before stall occurs, allowing high peaks in aerodynamic loading and subsequent structural stresses and fatigue. The invention allows the angle of attack to remain higher during post-rated operation, thus protecting the blade from overstress by enabling more rapid stall on the main airfoil during gusts than in the prior art. -
FIG. 11 shows anembodiment 51F in which eachslat 30 extends from a respective pivot bearing 78 therotor hub 26 Each slat pivots about aspanwise axis 80 positioned for example at 25-50% of the slat chord length C2 from the leading edge of the slat or positioned along an aerodynamic center of the slat. This embodiment may be implemented with cantilever slats without support struts Thus, it provides a relatively simple retrofit, for example, by installing a replacement spinner with attachedslats 30,actuators 70, and power andlogic connections 76. - The invention builds upon the use of multi-element airfoils by incorporating aerodynamic load control capabilities. These additional abilities reduce operational and non-operational aerodynamic blade loads and provide a mechanism for controlling rotor torque and power in addition to full-span pitch control The spoiler mechanisms of the embodiments herein have aerodynamic and structural synergy with the slat.
- While various embodiments of the present invention have been shown and described herein, it will be obvious that such embodiments are provided by way of example only. Numerous variations, changes and substitutions may be made without departing from the invention herein. Accordingly, it is intended that the invention be limited only by the spirit and scope of the appended claims
Claims (20)
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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US14/164,879 US20150211487A1 (en) | 2014-01-27 | 2014-01-27 | Dual purpose slat-spoiler for wind turbine blade |
US14/561,309 US9689374B2 (en) | 2013-10-09 | 2014-12-05 | Method and apparatus for reduction of fatigue and gust loads on wind turbine blades |
CN201580006051.8A CN105917116A (en) | 2014-01-27 | 2015-01-27 | Dual purpose slat-spoiler for wind turbine blade |
EP15703681.5A EP3099929A1 (en) | 2014-01-27 | 2015-01-27 | Dual purpose slat-spoiler for wind turbine blade |
PCT/US2015/012979 WO2015113011A1 (en) | 2014-01-27 | 2015-01-27 | Dual purpose slat-spoiler for wind turbine blade |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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US14/164,879 US20150211487A1 (en) | 2014-01-27 | 2014-01-27 | Dual purpose slat-spoiler for wind turbine blade |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/US2013/064060 Continuation-In-Part WO2015053768A1 (en) | 2013-10-09 | 2013-10-09 | Hinged vortex generator for excess wind load reduction on wind turbine |
Related Child Applications (1)
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US14/561,309 Continuation-In-Part US9689374B2 (en) | 2013-10-09 | 2014-12-05 | Method and apparatus for reduction of fatigue and gust loads on wind turbine blades |
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US20150211487A1 true US20150211487A1 (en) | 2015-07-30 |
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US14/164,879 Abandoned US20150211487A1 (en) | 2013-10-09 | 2014-01-27 | Dual purpose slat-spoiler for wind turbine blade |
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US (1) | US20150211487A1 (en) |
EP (1) | EP3099929A1 (en) |
CN (1) | CN105917116A (en) |
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WO2020052727A1 (en) * | 2018-09-13 | 2020-03-19 | Vestas Wind Systems A/S | A wind turbine with a blade carrying structure having aerodynamic properties |
US11014652B1 (en) * | 2018-05-03 | 2021-05-25 | Ardura, Inc. | Active lift control device and method |
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US20220025860A1 (en) * | 2018-12-13 | 2022-01-27 | Siemens Gamesa Renewable Energy A/S | Device and method of damping front and backward movements of a tower of a wind turbine |
WO2024052505A1 (en) * | 2022-09-09 | 2024-03-14 | Schlecht Paul Matthias | Wing arrangement comprising a main wing and a slat mounted thereto in front of the main wing and counter to a direction of flow |
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US11014652B1 (en) * | 2018-05-03 | 2021-05-25 | Ardura, Inc. | Active lift control device and method |
US11628930B2 (en) | 2018-05-03 | 2023-04-18 | Arctura, Inc. | Active lift control device and method |
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CN112703314A (en) * | 2018-09-13 | 2021-04-23 | 维斯塔斯风力系统有限公司 | Wind turbine with blade carrying structure with aerodynamic properties |
US11480151B2 (en) * | 2018-09-13 | 2022-10-25 | Vestas Wind Systems A/S | Wind turbine with a blade carrying structure having aerodynamic properties |
US20220025860A1 (en) * | 2018-12-13 | 2022-01-27 | Siemens Gamesa Renewable Energy A/S | Device and method of damping front and backward movements of a tower of a wind turbine |
US11732692B2 (en) * | 2018-12-13 | 2023-08-22 | Siemens Gamesa Renewable Energy A/S | Device and method of damping front and backward movements of a tower of a wind turbine |
CN113090442A (en) * | 2019-12-23 | 2021-07-09 | 江苏金风科技有限公司 | Adjustable wing blade, control method and control device thereof and wind generating set |
WO2024052505A1 (en) * | 2022-09-09 | 2024-03-14 | Schlecht Paul Matthias | Wing arrangement comprising a main wing and a slat mounted thereto in front of the main wing and counter to a direction of flow |
Also Published As
Publication number | Publication date |
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WO2015113011A1 (en) | 2015-07-30 |
EP3099929A1 (en) | 2016-12-07 |
CN105917116A (en) | 2016-08-31 |
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